Oh goodness those are both just very... Well scary! I would go with fearing being abducted and thrown into a van. You are in pretty much a hopeless situation at that point. At least if you wake up during surgery and feel everything you can scream, kick, and tell them you are feeling everything. Yes it would be terrible, but at least I think there would be a somewhat immediate remedy.
Falling through several floors of a building and landing on concrete or tumbling down several flights of steps and landing hard at the bottom?